<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>文本修饰</title>
    <!--也可以这样装饰文字：-->
    <style>
        h1 {text-decoration: overline;}
        h2 {text-decoration: line-through;}
        h3 {text-decoration: underline;}
    </style>
</head>
<body>
<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
<h3>This is heading 3</h3>
</body>
</html>